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Lock down your battery.
Available in three options -- Long External, Long Internal, and Short, the E-Tube Di2 SM-BMR1 Battery Mount securely holds your drivetrain's power source. Both long versions mount to either down or seat tube braze-ons. However, they're designed to be paired specifically with either type of wiring kit -- Internal or External.
The short version is designed to be used on bike frames that bear the specific Di2 battery mounting location on the chainstay or down tubes. It can be used with internal or external wiring kits. The Shimano E-Tube Di2 SM-BMR1 Battery Mount accepts the SM-BTR1 7.4 volt battery. Please Note: This is only the mount (battery not included).
Confused about how to build your Di2 Kit? Read our Learn Article.